CN103493348A - Lighting power circuit with peak current limiter for EMI filter - Google Patents

Lighting power circuit with peak current limiter for EMI filter Download PDF

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Publication number
CN103493348A
CN103493348A CN201280013208.6A CN201280013208A CN103493348A CN 103493348 A CN103493348 A CN 103493348A CN 201280013208 A CN201280013208 A CN 201280013208A CN 103493348 A CN103493348 A CN 103493348A
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circuit
terminal
effect transistor
lead
coupling
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CN201280013208.6A
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CN103493348B (en
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L.R.內罗涅
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Karent lighting solutions Co.,Ltd.
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General Electric Co
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H1/00—Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network
    • H03H1/0007—Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network of radio frequency interference filters
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/36—Controlling
    • H05B41/38—Controlling the intensity of light
    • H05B41/39—Controlling the intensity of light continuously
    • H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor
    • H05B41/3921—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/31—Phase-control circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/36—Circuits for reducing or suppressing harmonics, ripples or electromagnetic interferences [EMI]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/14—Arrangements for reducing ripples from dc input or output
    • H02M1/15—Arrangements for reducing ripples from dc input or output using active elements
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/355—Power factor correction [PFC]; Reactive power compensation

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Power Conversion In General (AREA)
  • Dc-Dc Converters (AREA)
  • Filters And Equalizers (AREA)
  • Networks Using Active Elements (AREA)

Abstract

Light source power circuits and EMI filters therefor are presented in which a depletion mode field effect transistor is connected in series with an EMI filter capacitor following an input rectifier to allow filtering of EMI and to limit capacitive currents during triac switching when powered through a phase-cutting dimmer circuit.

Description

There is the lighting source circuit for the peak current limiter of electromagnetic interface filter
Background technology
Usually adopt filter circuit for the conventional electrical power circuit of illuminator, the capacitor that wherein has inductor in positive DC branch and connect across the DC lead-out terminal of input rectifier, in order to operated as low pass filter.This filter circuit stops power conversion to switch caused high-frequency electromagnetic interference (EMI) arrival power line.These devices can be used in conjunction with wall type or the desk-top dimmer circuit with electric ballast or the collinear outfit triac be connected of LED driver.Dimming capability that this class dimmer provides so-called " house phase (phase cut) ", wherein the part of circuit AC waveform is removed in the cycle basically at each AC, in order to reduce light output.
Integral electronic lamp such as compact fluorescence design (CFL) and LED lamp can be used in being designed for the conventional lamp of incandescent lamp bulb, and can comprise the light adjusting circuit that allows light output to adjust by house phase light modulation (triac control).But the quick step that the triac operation that this class dimmer is controlled applies across the voltage of electromagnetic interface filter capacitor changes, thus cause in capacitor and power line in current spike.This can cause the degeneration of electromagnetic interface filter capacitor, and can damage the dimmer triac.
The previous trial that limits this class current spike relates to being connected in series of resistance and electromagnetic interface filter capacitor.But, in some are installed, from public (sharing) wall dimmer, operate a plurality of these electron-like driver or ballasts.In this class situation, even by the integral type current-limiting resistor, the peak current generated by independent lighting device in some cases also can be up to 3-8 A, and they add at dimmer, thereby causes potentially triac to damage or degenerate.Therefore, still need the improvement electromagnetic interface filter circuit for illuminator, it provides the required filtering in non-dimmer application, and can be in the circuit with house phase dimmer operation and do not make the dimmer triac damage or degenerate.
Summary of the invention
The disclosure provides the illuminator power circuit, and wherein input rectifier provides the power through the DC of rectification via the DC lead-out terminal to the electromagnetic interface filter circuit.In certain embodiments, this circuit forms the LED driver circuit, and wherein power converter circuit can operate to provide the DC that drives at least one LED light source output.In other embodiments, provide electric ballast, wherein power converter circuit comprises inverter, and inverter receives DC output and provides AC output to power to fluorescent lamp from DC to DC converter.This filter has the lead-out terminal that is connected to the power converter circuit with at least one DC to DC converter, and wherein this power converter circuit directly or indirectly provides power to one or more light sources.The electromagnetic interface filter circuit comprises filter capacity and field-effect transistor (FET) and the inductance with the first terminal be coupled with the first rectifier DC lead-out terminal.Inductance coupling high is between the first rectifier DC lead-out terminal and the first wave filter output terminal.Transistor comprises control gate and two source/drain terminals, wherein the second terminal coupling of the first source/drain terminal and filter capacity.Gate terminal and the second source/drain electrode and the second rectifier DC lead-out terminal coupling.
In certain embodiments, field-effect transistor is the depletion type device, and wherein control gate and the second source/drain electrode are connected to the 2nd DC lead-out terminal of rectifier jointly.Use in certain embodiments the N slot field-effect transistor, wherein filter capacitor terminal and positive ion deterioration DC lead-out terminal and with the coupling of the second source/drain terminal, and gate terminal is coupled with the negative rectifier terminal.Other embodiment provides the P channel depletion mode transistor, wherein capacitor terminal and negative rectifier output, with the second source/drain coupled, and grid is coupled with positive ion deterioration output.
In certain embodiments, provide a kind of enhancement mode field effect transistor, wherein biasing circuit is coupled to field-effect transistor to gate terminal, to provide bias voltage.In certain embodiments, the N channel device is used in conjunction with the first capacitor terminal that is coupled to positive ion deterioration output, and wherein transistor seconds source/drain electrode directly or indirectly is coupled with negative DC rectifier terminal.In certain embodiments, biasing circuit comprises the second resistor that is coupling in the first resistor between transistor gate and positive service voltage and is coupling in grid between exporting with negative rectifier.In certain embodiments, the 3rd resistor is coupling between the second source/drain electrode and negative rectifier DC lead-out terminal.
The accompanying drawing explanation
One or more example embodiment are proposed in following the detailed description and the accompanying drawings, wherein:
Fig. 1 has a schematic diagram of the demonstration LED driver of electromagnetic interface filter level according to illustrating of one or more aspects of the present disclosure, wherein the electromagnetic interface filter level has the N channel depletion type FET with the filter capacitor series coupled;
Fig. 2 is the schematic diagram illustrated for the demonstration electric ballast to one or more fluorescent lamp power supplies, comprising the N channel depletion type FET with the coupling of electromagnetic interface filter capacitor's series;
Fig. 3 is the schematic diagram be connected that the driver of Fig. 1 or Fig. 2 or ballast and house phase dimmer for the light modulation operation are shown;
Fig. 4 is the chart illustrated as some demonstration drain-source current curves of the function of the gate source voltage of the N channel depletion type FET in Fig. 1 and Fig. 2;
Fig. 5 is the schematic diagram that another demonstration electromagnetic interface filter circuit that can use in the power circuit of Fig. 1 or Fig. 2 is shown, comprising the P channel depletion type FET be connected with the electromagnetic interface filter capacitor's series; And
Fig. 6 is the schematic diagram that another electromagnetic interface filter embodiment is shown according to of the present disclosure, comprising the N channel depletion type FET with resistance biasing circuit.
Embodiment
Referring now to accompanying drawing, similar reference numerals is for meaning similar components, and various feature is not necessarily drawn in proportion.Fig. 1 and Fig. 2 illustrate for two demonstration electronic circuits 100 to the lighting device power supply.These power circuits 100 respectively comprise from external source reception signal or the input rectifier 101 of heterogeneous AC input power and the electromagnetic interface filter 102 that is coupled to the DC side of rectifier 101.In certain embodiments, rectifier circuit 101 is full-wave rectifier types, comprising forming for four diode rectifiers of the bridgt circuit of single-phase input or for 6 or more rectifiers of heterogeneous input.In other embodiments, rectifier circuit 101 can be half-wave rectifier or single diode.
The circuit 100 of Fig. 1 and Fig. 2 also comprises power converter circuit 110, and power converter circuit 110 comprises one or more DC to the DC converters for directly or indirectly powering at least one light source 108.In the example of Fig. 1, circuit 100 is the LED drivers with power inverter 110, wherein power inverter 110 comprises boost type DC-DC transducer-level 104, then is provided for afterwards driving the buck DC-DC converter 106 of the DC output of one or more LED lighting devices 108.Other form of DC-DC converter can be used for second circuit 106, such as the flyback converter with isolating transformer, buck-boost converter etc.During at other, possible LED driver configures, booster converter 1004 provides DC to the inverter (not shown), and inverter is the driving isolation transformer again, and its secondary winding drives the output rectifier that is connected to LED array.The circuit 100 of Fig. 2 forms electric ballast, and comprises that receiving DC from booster converter 104 exports and provide to the inverter 107 of the AC output of one or more fluorescent lamps 108 power supplies.In certain embodiments, can omit one of DC-DC transducer-level, and in certain embodiments, initial DC-DC transducer-level 104 is operated to provide power factor emendation function.In addition, the one or more brightness adjustment control that provide in transducer-level 104,106,107, in order to revise based on light modulation input (not shown) the power output that is applied to one or more light sources 108.
In addition, as mentioned above and as in Fig. 3, see, driver or ballast 100 can be powered from single-phase AC source and be had the brightness adjustment control via the house phase dimmer 200 with AC source and driver 100 series coupled.Dimmer is controlled 200 and is comprised triac T201, triac T201 cuts off selectively or interrupts the electric current (house phase) in the part in each cycle in AC source 101, so as according to user's adjustable resistance R201 to light output carry out light modulation.In certain embodiments, driver or ballast circuit 100 can be included in the structure had with the Edison base of AC input terminal.
As seen in Fig. 1 and Fig. 2, rectifier circuit 101 has the AC input terminal for being connected to external source to receive the AC input power, and provides the output through the DC of rectification at the first and second DC lead- out terminal 101a and 101b respectively.This rectifier output 101a, 101b are coupled to the first and second input terminals of electromagnetic interface filter circuit 102.Filter circuit 102 comprises again through coupling for example, to initial (boosting) DC-DC converter 104, to provide DC lead-out terminal 102a and the 102b of input.The output of booster converter 104 provides DC power in the input of buck converter 106, and its output for example, for directly driving one or more LED light sources 108 (Fig. 1) or booster converter output to be used for via inverter to one or more fluorescent lamps 180 indirectly power (Fig. 2).
Electromagnetic interface filter circuit 102 in Fig. 1 and Fig. 2 comprise the inductor L1 that is coupling in (just) DC branch and and the circuit branch of extending between the sub-101a of up and down rectifier output end and 101b respectively in the capacitor C1 that is connected in series of N channel depletion type field-effect transistor (FET) Q1.In the embodiment of Fig. 1 and Fig. 2, filter capacity C1 has the second terminal of the first terminal be coupled with positive DC rectifier output end and the first source that is connected to FET Q1/drain terminal SD1, and wherein inductor L1 is extending between positive DC rectifier output 101a and upper wave filter output terminal 102a.Another source of Q1/drain terminal SD2 is connected to the negative DC lead-out terminal 101b of rectifier circuit 101, as FET gate terminal G.
In operation, filter circuit 102 with apply complete sinusoidal AC input power compounding practice ground and provide EMI filtering to rectifier 101.In some example embodiment, inductor L1 has the inductance of about 25 mH, this inductance is enough large so that for example, the EMI of about 150 KHz electric current smaller (being approximately the EMI electric current of 10-20 ma), and the electromagnetic interface filter capacitor is approximately 15 nF, wherein EMI filtering provides the low-pass filtering of about 150 KHz or above interfering frequency ideally.In this respect, the electric capacity of increase C1 will advantageously improve the EMI filter capacity of circuit 102.But, in the situation that driver or ballast 100 for example, are connected to power line by house phase dimmer 200 (Fig. 3), when the measure that does not provide the disclosure to propose, the larger electric capacity of C1 enlarges the amplitude of the current spike that excites (firing) to produce in the middle of the cycle because of light modulation triac T201.
With reference to the chart 400 of Fig. 4, in order when the expection filter capacity is provided, to solve these current spikes, the filter circuit 102 of Fig. 1 and Fig. 2 provides impedance via the FET Q1 connected with filter capacitor C1 again.Depletion type device Q1 operates common connection (conducting drain-source channel conditions) mutually for non-house, and series connection is leaked to source resistance R DS oNillustration in chart 400, chart 400 illustrates the gate source voltage V as Q1 gSthe drain-source current curve (I of function dS).Because the FET in the embodiment of Fig. 1 and Fig. 2 is the depletion type device, so Q1 has negative threshold voltage V t, and non-zero current (being about 300-400 ma in one example) is conducted when grid is together with source shorted.As seen in Fig. 4, higher V gSvalue is corresponding to larger raceway groove current level I dS.In addition, for zero V gSvalue, the impedance of drain-source raceway groove is in fact with the channel voltage V increased dSlevel and increasing.In one embodiment, Q1 is chosen to about 1/3 to 1/2 zero V of reactance (1/ ω C) at capacitor gSthe RDS that there is about 2-10 Ω in lower depletion-mode oN, wherein the switching frequency of ω relative power transducer-level 110 is 150 KHz.This provides making to excite with triac the impedance of associated potential damage current spike decay, and the suitable filtering of the EMI of relative power converter 110 is provided simultaneously.In the example shown of Fig. 1 and Fig. 2, when triac T201 excites, Q1 will be restricted to about 300-400 ma to peak current.Therefore, even being connected to, share or public dimmer 200 in a plurality of circuit 100, the dimmer electric current also for example, wants little many than (from the 3-6 A spike of each ballast, its peak current adds at triac T201) in the situation that there is no electromagnetic interface filter 102 of the present disclosure.
Therefore, as depletion type FET Q1, when the EMI filter patterns operates, circuit 102 carries out filtering, and, when triac T201 excites, FET Q1 breaks away from saturated and peak current is restricted to hundreds of ma.Therefore, the design of Fig. 1 and Fig. 2 is not the fixed resistor in capacitor circuit, and is to provide the variableimpedance of clamping down on maximum current.In one example, use and there is the N channel depletion type FET Q1 of 250 volts of rated values, and can use the specified RDS of about 5 Ω oN.The use that is noted that variableimpedance FET Q1 can promote the electric capacity that increases C1 to promote to improve EMI filtering, and wherein FET Q1 provides current limliting to degenerate to alleviate capacitor or triac.
Fig. 5 illustrates another embodiment of the electromagnetic interface filter circuit 102 that can for example, use in driver or ballast types circuit (above Fig. 1 or Fig. 2).In this case, use P channel depletion type FET Q1, upper capacitor terminal and another source/leakage SD2 that wherein the first source/leakage SD1 is connected to C1 are connected to (just) rectifier DC lead-out terminal 101a.In this is realized, grid also is connected to DC main line (rail), and device Q1 is provided for the on-state resistance RDS of filtering and current spike protection oN(for example about 2-10 Ω).
With reference to Fig. 6, in other embodiments, can use enhancement mode FET Q1, for example the N channel device shown in figure again.Provide biasing circuit so that gate voltage to be set, comprise in this case the first resistor R1 for example be connected to, between grid G and positive Dc voltage VCC (example in be 15 volts), wherein the second resistor R2 is connected to (bear) DC rectifier from grid G and exports.In one example, for the Q1 threshold voltage V of about 3 volts t, gate voltage is biased to about 4 volts by circuit R1, R2.As above-described embodiment, this being connected in series of enhanced device and capacitor C1 provides RDS oN(for example about 2-10 Ω) supplies filtering, and works as V dSrealize the current spike protection during increase.In certain embodiments, the 3rd resistor R3 can be arranged between lower source/drain SD1 and lower DC terminal 101b, and 2 Ω resistors in example for example, in order to allow the electric current of about 500 ma in capacitor C1.When exciting triac T201, any current spike that exceeds this value causes V gSreduce, and the device Q1 there is the corresponding electric current that reduces.In other embodiments, Zener diode can be used in biasing circuit (the Zener voltage V that for example between FET grid and ground connection, has about 4 v zdevice) in.
Above-mentioned example just illustrates some possibility embodiment of various aspects of the present disclosure, and wherein equivalence change and/or modification will be that those skilled in the art will expect when reading and understanding this specification and accompanying drawing.Specifically about by the performed various functions of said modules (parts, device, system, circuit etc.), unless otherwise noted, otherwise estimate corresponding to any assembly such as hardware, processor operating software of the appointed function of carrying out described assembly or their combination (for the term (comprise and mention " parts ") of describing this class component, function equivalent), even the disclosed structure of the function realized shown in of the present disclosure with execution is not structural equivalents.Although may only for some, realize that one of them illustrates and/or described specific features of the present disclosure,, this feature can combine with one or more further features that for any given or application-specific may be expection or favourable other realization.In addition, unless otherwise noted, otherwise mention singular component or estimate to comprise two or more these class components or.In addition, at term, " comprising ", " comprising ", " having ", " having ", " with " or its variant for describe in detail and/or claims aspect, this class term is estimated to be included to term, " to comprise " similar mode.The present invention has been described with reference to preferred embodiment.Obviously, by reading and understand the detailed description of front, modifications and changes will be that those skilled in the art can expect.Estimate that the present invention is understood to include all these class modifications and changes.

Claims (14)

1. one kind for the circuit at least one light source power supply, comprising:
Rectifier circuit, it has the AC input terminal that receives the AC input power and the first and second DC lead-out terminals through the DC of rectification power is provided;
The electromagnetic interface filter circuit, it has the first and second filter input ends and the first and second wave filter output terminals with the coupling of the DC lead-out terminal of described rectifier circuit, and described electromagnetic interface filter circuit comprises:
Filter capacity, a wherein DC lead-out terminal coupling of the first terminal and described rectifier circuit,
Field-effect transistor comprises:
The first source/drain terminal, the second terminal coupling of itself and described filter capacity,
The second source/drain terminal, the 2nd DC lead-out terminal coupling of itself and described rectifier circuit, and
Gate terminal, the 2nd DC lead-out terminal coupling of itself and described rectifier circuit, and
Inductance, its have with the first terminal of a DC lead-out terminal coupling of described rectifier circuit and with the second terminal of described the first wave filter output terminal coupling; And
Power converter circuit, it comprises having and described wave filter output terminal (102a, 102) at least one DC to DC converter circuit of the DC input terminal of coupling, described power converter circuit can operate directly or indirectly provide power at least one light source.
2. circuit as claimed in claim 1, wherein, described power converter circuit can operate to provide the DC that drives at least one LED light source output.
3. circuit as claimed in claim 1, wherein, described power converter circuit comprises from described at least one DC to DC converter circuit and receives DC output and provide to the inverter of the AC output of at least one fluorescent lamp power supply.
4. circuit as claimed in claim 1, wherein, described field-effect transistor is depletion mode fet.
5. circuit as claimed in claim 4, wherein, described field-effect transistor is depletion type N slot field-effect transistor, the positive DC lead-out terminal coupling of the first terminal of wherein said filter capacity and described rectifier circuit, and the negative DC lead-out terminal coupling of wherein said the second source/drain terminal and described gate terminal and described rectifier circuit.
6. circuit as claimed in claim 5, wherein, described power converter circuit can operate to provide the DC that drives at least one LED light source output.
7. circuit as claimed in claim 5, wherein, described power converter circuit comprises from described at least one DC to DC converter circuit and receives DC output and provide to the inverter of the AC output of at least one fluorescent lamp power supply.
8. circuit as claimed in claim 4, wherein, described field-effect transistor is depletion type P-channel field-effect transistor (PEFT) transistor, the negative DC lead-out terminal coupling of the first terminal of wherein said filter capacity and described rectifier circuit, and the positive DC lead-out terminal coupling of wherein said the second source/drain terminal and described gate terminal and described rectifier circuit.
9. circuit as claimed in claim 1, wherein, described field-effect transistor is enhancement mode field effect transistor.
10. circuit as claimed in claim 9, wherein, described electromagnetic interface filter circuit comprises and is coupled to described field-effect transistor so that the biasing circuit of bias voltage to be provided to described gate terminal.
11. circuit as claimed in claim 10, wherein, described field-effect transistor is n channel enhancement type field effect transistor, the positive DC lead-out terminal coupling of the first terminal of wherein said filter capacity and described rectifier circuit, the negative DC lead-out terminal coupling of the second source of wherein said field-effect transistor/drain terminal and described rectifier circuit, and wherein said biasing circuit comprises:
The first resistor, it is coupling between the gate terminal and positive service voltage of described field-effect transistor, and
The second resistor, it is coupling between the negative DC lead-out terminal of the gate terminal of described field-effect transistor and described rectifier circuit.
12. circuit as claimed in claim 11, wherein, described electromagnetic interface filter circuit comprises the 3rd resistor between the negative DC lead-out terminal of the second source of being coupling in described field-effect transistor/drain terminal and described rectifier circuit.
13. circuit as claimed in claim 9, wherein, described power converter circuit can operate to provide the DC that drives at least one LED light source output.
14. circuit as claimed in claim 9, wherein, described power converter circuit comprises that receiving DC from described at least one DC to DC converter circuit exports and provide to the inverter of the AC output of at least one fluorescent lamp power supply.
CN201280013208.6A 2011-03-15 2012-02-24 There is the lighting source circuit of the peak current limiter for electromagnetic interface filter Active CN103493348B (en)

Applications Claiming Priority (3)

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US13/047,914 US8461774B2 (en) 2011-03-15 2011-03-15 Lighting power circuit with peak current limiter for EMI filter
US13/047914 2011-03-15
PCT/US2012/026514 WO2012161795A1 (en) 2011-03-15 2012-02-24 Lighting power circuit with peak current limiter for emi filter

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CN103493348B CN103493348B (en) 2016-08-17

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EP (1) EP2686944B1 (en)
JP (1) JP6200810B2 (en)
KR (1) KR101932172B1 (en)
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US20120235597A1 (en) 2012-09-20
BR112013021955A2 (en) 2018-09-11

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